Abstract
Recent attempts to construct a superstring theory that unifies all the interactions of nature, including gravity, in a finite anomaly-free quantum theory have led to the speculation that there may exist another form of matter (‘shadow matter’) in the Universe, which only interacts with ‘ordinary matter’ (for example, quarks, leptons) through gravity or gravitational-strength interactions. The existence of shadow matter would have many astrophysical and cosmological implications, some of which are discussed here.
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Kolb, E., Seckel, D. & Turner, M. The shadow world of superstring theories. Nature 314, 415–419 (1985). https://doi.org/10.1038/314415a0
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DOI: https://doi.org/10.1038/314415a0
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